Why should the "anonymity of users" (which most users in the WWW prefer - as it allows to "riskless" flame around or say "your game is shit!") want to use such a "local app store" (aunt lizzys app shop ;-))?

For developers you will use the developer corners of the WWW (coder forums, portals, ...).

As said: biggest problem for such an app store is the use-case for end-users not just developers/devgroups.